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Thank you very much Glenn, and sorry if my explanations are ambiguous. The first expression works. The second one is not working; I have an error message saying “sizes do not match in matrix function”. I’m actually computing the weighted mean of life expectancy for each year using pop as the weights...

If I correctly understand your question the denominator should be
(3) sum_{t} pop_it for t=1,...T

the sum of population for every period t

Sorry if I have not been so clear (and if my English is not very good). My workfile is structured as follows: I have a panel with 150 countries (that I have then grouped in blocs), years 1960 to 2008. Amongst my variables I have the life expectancy at birth for each country (lifexp) and each year an...

Hi all! I'm using EViews 7 and I have a panel workfile containing data for different countries. I would like to get the weighted mean of a variable across time using population weights. There is a way to construct this variable and to see it in a spreadsheet? I know I can use View->Descriptive Stati...